jit.convolve within Java?


    Sep 15 2010 | 4:36 am
    Is it possible to make use of jit.convolve within a Java context? I believe that it should be possible to set the convolution kernel as in the example below, but when I retrieve the "in2_name" attribute it comes back as null, even after explicitly setting it.
    import com.cycling74.jitter.JitterMatrix;
    import com.cycling74.jitter.JitterObject;
    import com.cycling74.max.Atom;
    import com.cycling74.max.MaxObject;
    public class Test extends MaxObject
    {
    private JitterObject conv;
    private JitterMatrix kernel;
    public Test( int width, int height )
    {
    // declare convolution kernel
    kernel = new JitterMatrix( 1, "float32", 3, 3 );
    kernel.setcell2d( 1, 0, new float[] { 1.f } );
    post( "my kernel: " + kernel.getName() );
    // create jit.convolve and set kernel
    conv = new JitterObject( "jit.convolve" );
    post( "BEFORE default kernel: " + conv.getAttr( "in2_name" ) );
    conv.setAttr( "in2_name", kernel.getName() );
    post( "AFTER explicit kernel: " + conv.getAttr( "in2_name" ) );
    }
    public void notifyDeleted()
    {
    conv.freePeer();
    kernel.freePeer();
    }
    }

    • Sep 15 2010 | 6:55 am
      There's no in2_name in a Jitter object as used from Java (or JS or C). You want to pass in an array of matrices to the matrixcalc method. Sorry there's not a clearer example of this in Java, but it's similar to Javascript.
      For example, when processing a matrix, something like:
      conv.matrixcalc(new JitterMatrix[] {input, kernel}, output);
    • Sep 15 2010 | 9:09 am
      Thanks Joshua - got it now.